A comprehensive guide for this common inflammatory skin disorder, broken down by subtype. Included is a detailed discussion about what is known about this condition and about the psychological impact it has on patients. Each subtype is discussed in terms of signs and symptoms, treatment options and also is accompanied by clinical images and links to other useful information on our site. There is also a thorough discussion of ocular inflammation that includes a review of the literature, explanation of the anatomy and pathology of the eye, clarification of confusing terms, and proposed pathogenesis.